<template>
  <section class="error-container">
    <span>4</span>
    <span><span class="screen-reader-text">0</span></span>
    <span>4</span>
    <p @click="$router.back()">回到上一页</p>
  </section>
</template>

<script>

export default {
  name: "404"
}
</script>

<style lang="less">
#app, body {
  height: 100%;
}

.error-container p {
  font-size: 16px;
  color: #fff;
  cursor: pointer;
}

.error-container {
  background-color: #416475;
  text-align: center;
  font-size: 180px;
  font-family: 'Catamaran', sans-serif;
  height: 100%;
  padding-top: 200px;
}

.error-container > span {
  display: inline-block;
  line-height: 0.7;
  position: relative;
  color: #FFB485;
  vertical-align: middle;
}

.error-container > span:nth-of-type(1) {
  color: #D1F2A5;
  animation: colordancing 4s infinite;
}

.error-container > span:nth-of-type(3) {
  color: #F56991;
  animation: colordancing2 4s infinite;
}

.error-container > span:nth-of-type(2) {
  width: 120px;
  height: 120px;
  border-radius: 999px;
}

.error-container > span:nth-of-type(2):before,
.error-container > span:nth-of-type(2):after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: inherit;
  height: inherit;
  border-radius: 999px;
  box-shadow: inset 30px 0 0 rgba(209, 242, 165, 0.4),
  inset 0 30px 0 rgba(239, 250, 180, 0.4),
    inset -30px 0 0 rgba(255, 196, 140, 0.4),
  inset 0 -30px 0 rgba(245, 105, 145, 0.4);
  animation: shadowsdancing 4s infinite;
}

.error-container > span:nth-of-type(2):before {
  transform: rotate(45deg);
}

.screen-reader-text {
  position: absolute;
  top: -9999em;
  left: -9999em;
}

@keyframes shadowsdancing {
  0% {
    box-shadow: inset 30px 0 0 rgba(209, 242, 165, 0.4),
    inset 0 30px 0 rgba(239, 250, 180, 0.4),
      inset -30px 0 0 rgba(255, 196, 140, 0.4),
    inset 0 -30px 0 rgba(245, 105, 145, 0.4);
  }
  25% {
    box-shadow: inset 30px 0 0 rgba(245, 105, 145, 0.4),
    inset 0 30px 0 rgba(209, 242, 165, 0.4),
      inset -30px 0 0 rgba(239, 250, 180, 0.4),
    inset 0 -30px 0 rgba(255, 196, 140, 0.4);
  }
  50% {
    box-shadow: inset 30px 0 0 rgba(255, 196, 140, 0.4),
    inset 0 30px 0 rgba(245, 105, 145, 0.4),
      inset -30px 0 0 rgba(209, 242, 165, 0.4),
    inset 0 -30px 0 rgba(239, 250, 180, 0.4);
  }
  75% {
    box-shadow: inset 30px 0 0 rgba(239, 250, 180, 0.4),
    inset 0 30px 0 rgba(255, 196, 140, 0.4),
      inset -30px 0 0 rgba(245, 105, 145, 0.4),
    inset 0 -30px 0 rgba(209, 242, 165, 0.4);
  }
  100% {
    box-shadow: inset 30px 0 0 rgba(209, 242, 165, 0.4),
    inset 0 30px 0 rgba(239, 250, 180, 0.4),
      inset -30px 0 0 rgba(255, 196, 140, 0.4),
    inset 0 -30px 0 rgba(245, 105, 145, 0.4);
  }
}

@keyframes colordancing {
  0% {
    color: #D1F2A5;
  }
  25% {
    color: #F56991;
  }
  50% {
    color: #FFC48C;
  }
  75% {
    color: #EFFAB4;
  }
  100% {
    color: #D1F2A5;
  }
}

@keyframes colordancing2 {
  0% {
    color: #FFC48C;
  }
  25% {
    color: #EFFAB4;
  }
  50% {
    color: #D1F2A5;
  }
  75% {
    color: #F56991;
  }
  100% {
    color: #FFC48C;
  }
}
</style>